5. The method to correct myopia is to wear a concave lens with an appropriate focal length. Suppose a person has myopia, and the nearest object he/she can clearly see without the accommodation of the lens is at a distance of 45 cm. What should be the focal length of the concave lens required for the person to clearly see objects at infinity?
(A) 22.5 cm
(B) 45.0 cm
(C) 90.0 cm
(D) 15.0 cm
(E) 60.0 cm

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統計: A(0), B(2), C(0), D(0), E(0) #3421200

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